31Z86 - ESAB 31Z86 Regulator Safety Disc Retaining Cap

Genuine ESAB 31Z86 Safety Disc Cap for Industrial Regulators

The ESAB 31Z86 Safety Disc Cap is a critical replacement component designed for the maintenance and repair of industrial gas regulators, specifically those within the ESAB, Purox, and Oxweld product lines. This precision-engineered brass cap serves a vital safety function: it retains the safety rupture disc (or burst disc) against the regulator body. In the event of a pressure spike that exceeds the regulator's design limits, the rupture disc is designed to fail safely, venting the excess gas. The 31Z86 cap holds this disc in place and typically includes venting features to direct the escaping gas away safely, preventing catastrophic failure of the regulator housing.

Manufactured to strict OEM specifications, this cap ensures the correct torque and seating pressure are applied to the safety disc assembly. Using non-OEM or makeshift parts in a high-pressure gas regulator safety assembly is extremely dangerous and violates safety standards (such as CGA E-4). The 31Z86 is machined from high-quality brass, offering excellent resistance to corrosion and deformation under load. It is compatible with a variety of R-series regulators commonly found in heavy industrial welding, cutting, and heating applications.

Maintenance professionals and equipment repair technicians rely on the 31Z86 to restore regulators to full operational safety. Whether performing a routine overhaul or replacing a blown rupture disc, installing a fresh, undamaged cap is essential to ensure the threads engage properly and the safety seal is maintained. This part is a direct replacement for the original cap found on many legacy and modern ESAB pressure control devices.

Technical Specifications

• Part Number: 31Z86
• Manufacturer: ESAB / Purox / Oxweld
• Material: Brass
• Function: Retains safety rupture disc
• Compatibility: Various R-series regulators